求翻译：从1986年到1990年的数据变化我们可以看出，谷物类一直占据主要位置。同时人们对蛋白质和维生素的需求有所提高，牛奶，蔬菜和水果也走进人们的生活。同时，饭桌上不仅仅有蔬菜，肉类也逐渐由原来的17%增加到21%。是什么意思？

We can see the data changes from 1986 to 1990, the cereal has been a dominant position. At the same time, increased demand of protein and vitamins, milk, vegetables and fruits into people's lives. At the same time, the table is not only vegetables, meat gradually from 17% to 21%.

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Data changes we can see that from 1986 to 1990, grain class leading position. At the same time an increase in demand for proteins and vitamins, milk, vegetables and fruit into people's lives. At the same time, dinner-not just vegetables, meat is gradually increased from 17% to 21%.